0865ecc515
This is take two of #70976. This iteration of the patch makes sure that custom diagnostics without any warning group don't get promoted by `-Werror` or `-Wfatal-errors`. This implements parts of the extension proposed in https://discourse.llvm.org/t/exposing-the-diagnostic-engine-to-c/73092/7. Specifically, this makes it possible to specify a diagnostic group in an optional third argument.
100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
//===- ListWarnings.h - diagtool tool for printing warning flags ----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides a diagtool tool that displays warning flags for
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// diagnostics.
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//
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//===----------------------------------------------------------------------===//
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#include "DiagTool.h"
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#include "DiagnosticNames.h"
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#include "clang/Basic/AllDiagnostics.h"
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#include "clang/Basic/Diagnostic.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/Support/Format.h"
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DEF_DIAGTOOL("list-warnings",
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"List warnings and their corresponding flags",
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ListWarnings)
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using namespace clang;
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using namespace diagtool;
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namespace {
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struct Entry {
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llvm::StringRef DiagName;
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llvm::StringRef Flag;
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Entry(llvm::StringRef diagN, llvm::StringRef flag)
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: DiagName(diagN), Flag(flag) {}
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bool operator<(const Entry &x) const { return DiagName < x.DiagName; }
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};
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}
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static void printEntries(std::vector<Entry> &entries, llvm::raw_ostream &out) {
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for (const Entry &E : entries) {
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out << " " << E.DiagName;
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if (!E.Flag.empty())
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out << " [-W" << E.Flag << "]";
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out << '\n';
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}
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}
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int ListWarnings::run(unsigned int argc, char **argv, llvm::raw_ostream &out) {
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std::vector<Entry> Flagged, Unflagged;
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llvm::StringMap<std::vector<unsigned> > flagHistogram;
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for (const DiagnosticRecord &DR : getBuiltinDiagnosticsByName()) {
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const unsigned diagID = DR.DiagID;
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if (DiagnosticIDs{}.isNote(diagID))
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continue;
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if (!DiagnosticIDs{}.isWarningOrExtension(diagID))
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continue;
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Entry entry(DR.getName(), DiagnosticIDs{}.getWarningOptionForDiag(diagID));
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if (entry.Flag.empty())
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Unflagged.push_back(entry);
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else {
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Flagged.push_back(entry);
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flagHistogram[entry.Flag].push_back(diagID);
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}
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}
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out << "Warnings with flags (" << Flagged.size() << "):\n";
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printEntries(Flagged, out);
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out << "Warnings without flags (" << Unflagged.size() << "):\n";
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printEntries(Unflagged, out);
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out << "\nSTATISTICS:\n\n";
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double percentFlagged =
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((double)Flagged.size()) / (Flagged.size() + Unflagged.size()) * 100.0;
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out << " Percentage of warnings with flags: "
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<< llvm::format("%.4g", percentFlagged) << "%\n";
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out << " Number of unique flags: "
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<< flagHistogram.size() << '\n';
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double avgDiagsPerFlag = (double) Flagged.size() / flagHistogram.size();
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out << " Average number of diagnostics per flag: "
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<< llvm::format("%.4g", avgDiagsPerFlag) << '\n';
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out << " Number in -Wpedantic (not covered by other -W flags): "
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<< flagHistogram["pedantic"].size() << '\n';
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out << '\n';
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return 0;
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}
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